Campagnolo Comp 10s Triple FD: 9s chain compatible?

Formerly, similar derailleurs were commonly marketed as "9/10 speed", but nowadays I don't see the "9" anymore... As I understand, the trick was to remove the plastic insert from the cage, to allow wider chain mowing flawlessly. On Campy's PDF from the page above, the insert is still noted - but actual picture on the site seems to be different.

Funny enough, the very same derailleur on eBay does have such a description:

Compatible with all Campagnolo 9 and 10 speed Triple setups

If anybody have actual experience on using that mech with 9-speed chain, I'd be very grateful for your opinions.

P.S. My setup is based on FSA 53-42-30 cranks & CN-7701 chain, frame 73° tube angle. And yes, I'm aware that violating the "Campy-only" rule is a blasphemy, but I'm trying to improve the situation!

Something I'd be interested in knowing as well. Was considering using this FD in a Shimergo setup with a 10 spd Centaur shifters, an 8 spd RD/cassette, and a 9 speed chain because I'd read this cage was longer than the shimano road triple FD cages and that gave better leverage for shifting (apparently the Campy shifters don't like the pressure needed to shift the shorter shimano cage according to some people).

Punctuation is important. It's the difference between "I helped my uncle, Jack, off a horse" and "I helped my uncle Jack off a horse"

(apparently the Campy shifters don't like the pressure needed to shift the shorter shimano cage according to some people).

That's true, and is the main reason for me to replace FD-R443 with one more appropriate to my Mirage 9-speed Ergopowers. IMHO, the difficulty is caused not by cage lenght, but merely by different spring force and/or leverage ratio...

My Bianchi has a triple on the front and a 9 speed in the back. I occasionally need to trim the front, but that's usually only when making wide gear changes down the the smaller cogs. If I'm just moving between 2 or 3 gears, I don't usually need to touch the FD.

Formerly, similar derailleurs were commonly marketed as "9/10 speed", but nowadays I don't see the "9" anymore... As I understand, the trick was to remove the plastic insert from the cage, to allow wider chain mowing flawlessly. On Campy's PDF from the page above, the insert is still noted - but actual picture on the site seems to be different.

Thanks HillRider, your input is essentially answered my question, as your system is quite close to mine (as far as FD is concerned). About insert, you seems to be right: Campy's PDF doesn't mention it to be specifically "double-only", but I also never seen it on triples.

My current RD is 105, but instead of putting Shiftmate I've just re-routed the cable "incorrectly" to match the ratios: it works absolutely flawlessly, so it will be the last Shimano thing I'll eliminate, except for the pedals.